Dustproof belt pulley

Abstract

The utility model discloses a dustproof belt pulley which comprises a body, a bearing is arranged in the middle of the surface of the top of the body, rims are symmetrically installed on the two sides of the surface of the top of the body, supporting rods are fixedly connected to the surfaces of the tops of the rims, and baffles are fixedly connected to the surfaces of the tops of the supporting rods. Extending blocks are symmetrically mounted on the two sides of the baffle, sliding grooves are symmetrically formed in the two sides of the surface of the top of the baffle, sliding rods are slidably connected into the sliding grooves, and cleaning plates are fixedly connected to the surfaces of the tops of the sliding rods, so that the device can effectively shield dust; and meanwhile, dust accumulation can be avoided through a scraping plate, meanwhile, a worker can disassemble a cleaning plate and a baffle more conveniently, dust and sand grains can be prevented from entering, the service life of the bearing and the service life of the body are prolonged, and therefore the practicability and flexibility of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pulleys, in particular to a dustproof pulley. Background Art

[0002] At present, when the automobile engine is in use, it needs to be transmitted through the pulley via the transmission belt and the automobile engine, and it and the automobile engine are synchronously operated. After the current pulley is connected to the output shaft of the automobile generator, there will be a certain gap at the connection, which will lead to a poor sealing effect of the pulley, making it easy for dust to enter the pulley to generate vibration or noise, resulting in a short life of the pulley. At the same time, when the automobile engine suddenly accelerates or decelerates, due to the action of inertia, the speed of the generator output shaft and the pulley will be instantly out of sync. After working for a period of time, the pulley will slip from the output shaft of the generator, causing the failure of the automobile engine and affecting its normal use.

[0003] After searching, the Chinese patent public number is: CN216842930U, which discloses a dust-proof and anti-skid automobile generator pulley. By setting a first bolt, a slider, a rotating rod, a vertical plate and an arc plate, after the pulley body is threadedly connected to the generator output shaft, the first bolt is rotated to drive the slider to move, and then the slider drives the arc plate to move toward the generator output shaft through the rotating rod and the vertical plate, so that the side wall of the arc plate is tightly fitted with the side wall of the generator output shaft, so that the generator output shaft and the pulley body are installed more firmly, thereby improving the anti-skid performance. By setting a dustproof mechanism, the sleeve can prevent external dust from entering the connection gap between the generator output shaft and the pulley body, and prevent dust from entering the gap, resulting in poor sealing effect of the pulley, causing vibration or noise in the pulley, and resulting in a shorter life of the pulley body.

[0004] The above patent makes the installation of the main body more secure by setting the first bolt, the slider, the rotating rod, the vertical plate and the arc plate, thereby improving the anti-slip property. By setting the dustproof mechanism, dust is prevented from entering the gap, resulting in poor sealing effect of the pulley, causing vibration or noise in the pulley. However, the sleeve in the dustproof mechanism can prevent the entry of dust. However, after long-term use, more dust will accumulate on the surface of the sleeve. At the same time, when the main body and the bearing are running, some vibration force will be generated. If the sleeve is in vibration for a long time, the connection may become loose or broken, so that dust enters the bearing and the inside of the main body, causing wear of the bearing or the main body, thereby reducing the service life of the bearing or the main body. At the same time, the first bolt makes the installation of the main body more secure. However, when the staff needs to maintain the main body and the bearing, it is inconvenient to disassemble, which reduces the work efficiency of the staff. Utility Model Content

[0005] The technical problems to be solved by the utility model are as follows: it solves the problem that after long-term use, a lot of dust will accumulate on the surface of the sleeve, and at the same time, when the main body and the bearing are running, some vibration force will be generated, and the sleeve is in vibration for a long time, which may cause the connection to loosen or break, so that dust enters the bearing and the inside of the main body, causing the bearing or the main body to wear, thereby reducing the service life of the bearing or the main body. At the same time, the first bolt makes the installation of the main body more secure, but when the staff needs to maintain the main body and the bearing, it is inconvenient to disassemble, which reduces the work efficiency of the staff.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A dustproof pulley comprises a body, a bearing is arranged in the middle of the top surface of the body, wheel rims are symmetrically installed on both sides of the top surface of the body, a support rod is fixedly connected to the top surface of the wheel rim, a baffle is fixedly connected to the top surface of the support rod, an extension block is symmetrically installed on both sides of the baffle, a slide groove is symmetrically opened on both sides of the top surface of the baffle, a slide rod is slidably connected inside the slide groove, a cleaning plate is fixedly connected to the top surface of the slide rod, a plurality of scrapers are fixedly installed on the bottom surface of the cleaning plate, a fixed box is fixedly connected to one side surface of the extension block, a slide plate is slidably connected inside the fixed box, A gear is fixedly installed inside the skateboard, and a toothed plate is meshedly connected to the bottom surface of the gear, and the bottom surface of the toothed plate is fixedly connected to the skateboard, a fixing plate is fixedly installed on the side of the skateboard away from the gear, a first telescopic rod is fixedly connected to the middle of one side surface of the fixing plate, a first spring is sleeved on the side surface of the first telescopic rod away from the fixing plate, a clamping plate is fixedly connected to the one side surface of the first spring, and the other side surface of the first spring is fixedly connected to the fixing plate, a side of the first telescopic rod away from the first spring is fixedly connected to the clamping plate, the first telescopic rod is connected through the skateboard, and the scraper is fit-connected to the baffle.

[0008] As a further solution of the utility model: a clamping rod is connected through one side of the top surface of the fixed box, a second spring is fixedly connected to the top surface of the clamping rod, a push plate is fixedly connected to the top surface of the second spring, a clamping groove is provided on the top surface of the slide plate, the clamping rod is engaged with the clamping groove, a first limiting groove is provided on the side surface of the support rod close to the top, and the first limiting groove is engaged with the clamping plate.

[0009] As a further solution of the utility model: a connecting block is fixedly connected to the middle of the bottom surface of the cleaning plate, a push rod is fixedly connected to the middle of the bottom surface of the connecting block, a third spring is symmetrically installed on both sides of the bottom surface of the connecting block, a sliding rod is fixedly connected to the bottom surface of the push rod, a sliding sleeve is slidably connected to the surface of the sliding rod, and a blocking plate is fixedly connected to the bottom surface of the sliding rod.

[0010] As a further solution of the utility model: a connecting rod is fixedly connected to the middle of the top surface of the bearing, a stabilizing block is fixedly installed inside the top surface of the connecting rod, a groove is opened inside the stabilizing block, push rods are connected through both sides of the inner side of the groove, a fourth spring is sleeved on the surface of the push rod away from the groove, one side surface of the fourth spring is fixedly connected to a limiting plate, the other side surface of the fourth spring is fixedly connected to the groove, the side of the push rod away from the fourth spring is fixedly connected to the limiting plate, the limiting plate is fit-connected to the blocking plate, the connecting rod is connected through the baffle, and the connecting rod is fit-connected to the third spring.

[0011] As a further solution of the utility model: a rotating rod is connected through the middle of the interior of the gear, and the top surface of the rotating rod is rotatably connected to a bearing seat, the top surface of the bearing seat is fixedly connected to a fixed box, the rotating rod is connected through the slide board, and the bottom surface of the rotating rod is fixedly connected to a handle, the rotating rod is connected through the fixed box, and sliding grooves are symmetrically provided on both sides of the rotating rod close to the fixed box, a second telescopic rod is fixedly installed inside the sliding groove, a fifth spring is sleeved on the surface of the second telescopic rod, and the bottom surface of the fifth spring is fixedly connected to a limiting rod, the top surface of the fifth spring is fixedly connected to the sliding groove, and the bottom surface of the second telescopic rod is fixedly connected to the limiting rod.

[0012] As a further solution of the utility model: a plurality of second limiting grooves are provided on the bottom surface of the fixed box, and the second limiting grooves are engaged and connected with the limiting rods.

[0013] As a further solution of the utility model: a plurality of placement grooves are provided on the bottom surface of the bearing, a third telescopic rod is fixedly installed inside the placement groove, a sixth spring is sleeved on the surface of the third telescopic rod, a rubber pad is fixedly connected to the bottom surface of the sixth spring, the top surface of the sixth spring is fixedly connected to the placement groove, the bottom surface of the third telescopic rod is fixedly connected to the rubber pad, and the bottom surface of the rubber pad is fit-connected to the body.

[0014] Beneficial effects of the utility model:

[0015] When the cleaning plate is replaced, the push rod on the cleaning plate can be lowered by pressing the cleaning plate, thereby driving the sliding rod to descend, and the sliding rod can be lowered to push the movement of the sliding sleeve, so that the sliding sleeve has an extruding effect on the push rod, so that the push rod moves to both sides. When the sliding sleeve moves to one side of the baffle plate and fits together with the baffle plate, the push rod is reset by the characteristics of the fourth spring, and the cleaning plate is pulled to make the bottom of the sliding sleeve slidably connected with the top of the push rod, so that the push rod is separated from the stabilizing block, so that the cleaning plate can be disassembled and replaced, thereby improving the work efficiency of the staff.

[0016] 2. When the baffle is disassembled, the handle can be turned to drive the rotation of the rotating rod, thereby driving the rotation of the gear, so that the slide plate can be moved, and the card plate is separated from the first limit groove. When the slide plate moves to a certain distance, the card rod and the card groove are engaged together, so that the card rod can limit the slide plate, thereby preventing the slide plate from suddenly moving and resetting when the staff is disassembling, which makes it more troublesome for the staff to disassemble the baffle. At the same time, when the handle stops turning, the cooperation between the second telescopic rod and the fifth spring can squeeze the limit rod, so that the limit rod is engaged with the second limit groove, thereby realizing the limitation of the rotating rod and the gear, thereby preventing the staff from accidentally touching the handle, causing the handle to rotate, thereby causing the movement of the slide plate, so that the staff can more conveniently maintain the bearing and the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the overall front view structure of the utility model;

[0020] Figure 3 yes Figure 1 A schematic diagram of the enlarged structure of the middle A area;

[0021] Figure 4 yes Figure 1 Schematic diagram of the enlarged structure of the middle B area;

[0022] Figure 5 It is a schematic diagram of the internal structure of the fixed box in the utility model;

[0023] Figure 6 This is a schematic diagram of the internal structure of the fixed box in the utility model when viewed from above;

[0024] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure of the middle C area.

[0025] In the figure: 1, body; 2, bearing; 3, wheel rim; 4, support rod; 5, baffle; 6, extension block; 7, slide groove; 8, slide rod; 9, cleaning plate; 10, scraper; 11, fixed box; 12, slide plate; 13, gear; 14, tooth plate; 15, fixed plate; 16, first telescopic rod; 17, first spring; 18, clamping plate; 19, clamping rod; 20, second spring; 21, push plate; 22, clamping groove; 23, first limit groove; 24, connecting block; 25, push rod; 26. The third spring; 27. The sliding rod; 28. The sliding sleeve; 29. ​​The blocking plate; 30. The connecting rod; 31. The stabilizing block; 32. The groove; 33. The push rod; 34. The fourth spring; 35. The limiting plate; 36. The rotating rod; 37. The bearing seat; 38. The handle; 39. The sliding groove; 40. The second telescopic rod; 41. The fifth spring; 42. The limiting rod; 43. The second limiting groove; 44. The placement groove; 45. The third telescopic rod; 46. The sixth spring; 47. The rubber pad. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figure 1-7As shown, a dustproof pulley comprises a body 1, a bearing 2 is arranged in the middle of the top surface of the body 1, rims 3 are symmetrically installed on both sides of the top surface of the body 1, a support rod 4 is fixedly connected to the top surface of the rim 3, a baffle 5 is fixedly connected to the top surface of the support rod 4, extension blocks 6 are symmetrically installed on both sides of the baffle 5, slide grooves 7 are symmetrically opened on both sides of the top surface of the baffle 5, a slide rod 8 is slidably connected inside the slide groove 7, a cleaning plate 9 is fixedly connected to the top surface of the slide rod 8, a plurality of scrapers 10 are fixedly installed on the bottom surface of the cleaning plate 9, a fixed box 11 is fixedly connected to the surface of one side of the extension block 6, a slide plate 12 is slidably connected inside the fixed box 11, a gear 13 is fixedly installed inside the slide plate 12, a tooth plate 14 is meshingly connected to the bottom surface of the gear 13, the bottom surface of the tooth plate 14 is fixedly connected to the slide plate 12, and the inside of the slide plate 12 is away from the gear A fixing plate 15 is fixedly installed on one side of 13, and a first telescopic rod 16 is fixedly connected to the middle of one side surface of the fixing plate 15, and a first spring 17 is sleeved on the side surface of the first telescopic rod 16 away from the fixing plate 15, and a clamping plate 18 is fixedly connected to one side surface of the first spring 17, and the other side surface of the first spring 17 is fixedly connected to the fixing plate 15, and the side of the first telescopic rod 16 away from the first spring 17 is fixedly connected to the clamping plate 18, and the first telescopic rod 16 is connected through the slide plate 12, and the scraper 10 is fitted and connected to the baffle 5, and is separated from the first limiting groove 23 by the clamping plate 18, so that the staff can more conveniently disassemble the baffle 5, thereby improving the work efficiency of the staff, and at the same time, through the fit of the scraper 10 and the baffle 5, the scraper 10 can clean the surface of the baffle 5, thereby effectively avoiding the accumulation of dust.

[0028] A clamping rod 19 is connected through one side of the top surface of the fixed box 11, and a second spring 20 is fixedly connected to the top surface of the clamping rod 19, and a push plate 21 is fixedly connected to the top surface of the second spring 20. A clamping groove 22 is provided on the top surface of the slide plate 12, and the clamping rod 19 is engaged with the clamping groove 22. A first limiting groove 23 is provided on the side surface of the support rod 4 close to the top, and the first limiting groove 23 is engaged with the clamping plate 18. A connecting block 24 is fixedly connected to the middle of the bottom surface of the cleaning plate 9, and a push rod 25 is fixedly connected to the middle of the bottom surface of the connecting block 24. A third spring 26 is symmetrically installed on both sides of the bottom surface of the connecting block 24, and a sliding rod 27 is fixedly connected to the bottom surface of the push rod 25. A sliding sleeve 28 is slidably connected to the surface of the sliding rod 27, and a blocking plate 29 is fixedly connected to the bottom surface of the sliding rod 8. The top surface of the bearing 2 is fixedly connected to the middle of the top surface A connecting rod 30 is connected, and a stabilizing block 31 is fixedly installed inside the top surface of the connecting rod 30. A groove 32 is opened inside the stabilizing block 31, and a push rod 33 is connected to both sides of the groove 32. A fourth spring 34 is sleeved on the surface of the push rod 33 away from the groove 32, and a limit plate 35 is fixedly connected to the surface of one side of the fourth spring 34. The other side surface of the fourth spring 34 is fixedly connected to the groove 32, and the side of the push rod 33 away from the fourth spring 34 is fixedly connected to the limit plate 35, and the limit plate 35 is fit-connected to the blocking plate 29. The connecting rod 30 is connected through the baffle 5, and the connecting rod 30 is fit-connected to the third spring 26, so that the staff can replace the cleaning plate 9 more conveniently, so that the cleaning plate 9 can be disassembled more quickly, so that the body 1 and the bearing 2 can be maintained.

[0029] A rotating rod 36 is connected through the middle of the gear 13, and a bearing seat 37 is rotatably connected to the top surface of the rotating rod 36. The top surface of the bearing seat 37 is fixedly connected to the fixed box 11. The rotating rod 36 is connected through the slide plate 12, and a handle 38 is fixedly connected to the bottom surface of the rotating rod 36. The rotating rod 36 is connected through the fixed box 11. Sliding grooves 39 are symmetrically provided on both sides of the rotating rod 36 near the fixed box 11. A second telescopic rod 40 is fixedly installed inside the sliding groove 39. A fifth spring 41 is sleeved on the surface of the second telescopic rod 40. The fifth spring 41 is The bottom surface of the spring 41 is fixedly connected to the limit rod 42, the top surface of the fifth spring 41 is fixedly connected to the sliding groove 39, and the bottom surface of the second telescopic rod 40 is fixedly connected to the limit rod 42, so that through the cooperation between the second telescopic rod 40 and the fifth spring 41, the limit rod 42 can be squeezed, so that the limit rod 42 is engaged with the second limit groove 43, thereby achieving the limitation of the rotating rod 36 and the gear 13, thereby preventing the staff from accidentally touching the handle 38, causing the handle 38 to rotate, thereby causing the skateboard 12 to move.

[0030] A plurality of second limiting grooves 43 are provided on the bottom surface of the fixed box 11, and the second limiting grooves 43 are engaged with the limiting rod 42. A plurality of placement grooves 44 are provided on the bottom surface of the bearing 2. A third telescopic rod 45 is fixedly installed inside the placement groove 44. A sixth spring 46 is sleeved on the surface of the third telescopic rod 45. A rubber pad 47 is fixedly connected to the bottom surface of the sixth spring 46. The top surface of the sixth spring 46 is fixedly connected to the placement groove 44, and the bottom surface of the third telescopic rod 45 is fixedly connected to the rubber pad 47. The bottom surface of the rubber pad 47 is fit-connected to the body 1, so that the device can effectively block dust. At the same time, the scraper 10 can avoid the accumulation of dust. At the same time, it also makes it more convenient for the staff to disassemble the cleaning plate 9 and the baffle 5, thereby avoiding the infiltration of dust and sand, thereby extending the service life of the bearing 2 and the body 1, thereby improving the practicality and flexibility of the device.

[0031] The working principle of the utility model is as follows: first, when the main body 1 is running, the bearing 2 is driven to rotate, and the rotation of the bearing 2 can drive the rotation of the connecting rod 30, and the rotation of the connecting rod 30 can drive the rotation of the cleaning plate 9, and the rotation of the cleaning plate 9 can drive the scraper 10 to clean the surface of the baffle 5. At the same time, when the cleaning plate 9 is replaced, the cleaning plate 9 can be pressed to make the push rod 25 on the cleaning plate 9 drop, and the drop of the push rod 25 can drive the sliding rod 27 to drop, and the drop of the sliding rod 27 can make The sliding sleeve 28 is pushed to move, and through the movement of the sliding sleeve 28, the sliding sleeve 28 squeezes the push rod 33, so that the push rod 33 moves to both sides. When the sliding sleeve 28 moves to one side of the blocking plate 29 and fits together with the blocking plate 29, the push rod 33 is reset by the characteristics of the fourth spring 34. By pulling the cleaning plate 9, the bottom of the sliding sleeve 28 is slidably connected with the top of the push rod 33, so that the push rod 25 can be taken out, thereby separating the push rod 25 from the stabilizing block 31, so that the cleaning plate 9 can be disassembled and replaced.

[0032] When the slider 12 is moved to a certain distance, the clamping rod 19 is engaged with the clamping groove 22, so that the clamping rod 19 can limit the slider 12. At the same time, when the handle 38 stops rotating, the limiting rod 42 can be squeezed by the cooperation between the second telescopic rod 40 and the fifth spring 41, so that the limiting rod 42 is engaged with the second limiting groove 43, thereby limiting the rotating rod 36 and the gear 13, thereby preventing the staff from accidentally touching the handle 38, causing the handle 38 to rotate, thereby causing the slider 12 to move.

[0033] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A dustproof pulley, comprising a body (1), characterized in that: A bearing (2) is arranged in the middle of the top surface of the body (1), and wheel rims (3) are symmetrically installed on both sides of the top surface of the body (1), and the top surface of the wheel rim (3) is fixedly connected to a support rod (4), and the top surface of the support rod (4) is fixedly connected to a baffle (5), and extension blocks (6) are symmetrically installed on both sides of the baffle (5), and slide grooves (7) are symmetrically opened on both sides of the top surface of the baffle (5), and a slide rod (8) is slidably connected inside the slide groove (7), and a cleaning plate (9) is fixedly connected to the top surface of the slide rod (8), and a plurality of scrapers (10) are fixedly installed on the bottom surface of the cleaning plate (9), and a fixed box (11) is fixedly connected to one side surface of the extension block (6), and a slide plate (12) is slidably connected inside the fixed box (11), and a gear (13) is fixedly installed inside the slide plate (12). ), the bottom surface of the gear (13) is meshingly connected with a toothed plate (14), the bottom surface of the toothed plate (14) is fixedly connected to the slide plate (12), a fixed plate (15) is fixedly installed on the side of the slide plate (12) away from the gear (13), a first telescopic rod (16) is fixedly connected in the middle of one side surface of the fixed plate (15), a first spring (17) is sleeved on the side surface of the first telescopic rod (16) away from the fixed plate (15), a clamping plate (18) is fixedly connected to the one side surface of the first spring (17), the other side surface of the first spring (17) is fixedly connected to the fixed plate (15), the side of the first telescopic rod (16) away from the first spring (17) is fixedly connected to the clamping plate (18), the first telescopic rod (16) is connected to the slide plate (12) through, and the scraper (10) is fitted and connected to the baffle (5).

2. A dustproof pulley according to claim 1, characterized in that: A clamping rod (19) is connected to one side of the top surface of the fixed box (11), a second spring (20) is fixedly connected to the top surface of the clamping rod (19), a push plate (21) is fixedly connected to the top surface of the second spring (20), a clamping groove (22) is provided on the top surface of the slide plate (12), the clamping rod (19) is engaged with the clamping groove (22), and a first limiting groove (23) is provided on the side surface of the support rod (4) close to the top, and the first limiting groove (23) is engaged with the clamping plate (18).

3. A dustproof pulley according to claim 1, characterized in that: A connecting block (24) is fixedly connected in the middle of the bottom surface of the cleaning plate (9), a push rod (25) is fixedly connected in the middle of the bottom surface of the connecting block (24), third springs (26) are symmetrically installed on both sides of the bottom surface of the connecting block (24), a sliding rod (27) is fixedly connected to the bottom surface of the push rod (25), a sliding sleeve (28) is slidably connected to the surface of the sliding rod (27), and a blocking plate (29) is fixedly connected to the bottom surface of the sliding rod (8).

4. A dustproof pulley according to claim 1, characterized in that: A connecting rod (30) is fixedly connected in the middle of the top surface of the bearing (2), a stabilizing block (31) is fixedly installed inside the top surface of the connecting rod (30), a groove (32) is provided inside the stabilizing block (31), a push rod (33) is connected through both sides of the inside of the groove (32), a fourth spring (34) is sleeved on the surface of the push rod (33) away from the groove (32), a limit plate (35) is fixedly connected to one side surface of the fourth spring (34), the other side surface of the fourth spring (34) is fixedly connected to the groove (32), a side of the push rod (33) away from the fourth spring (34) is fixedly connected to the limit plate (35), the limit plate (35) is fitted and connected to the blocking plate (29), the connecting rod (30) is connected through the baffle (5), and the connecting rod (30) is fitted and connected to the third spring (26).

5. A dustproof pulley according to claim 1, characterized in that: A rotating rod (36) is connected through the middle of the gear (13), and a bearing seat (37) is rotatably connected to the top surface of the rotating rod (36). The top surface of the bearing seat (37) is fixedly connected to the fixed box (11). The rotating rod (36) is connected through the slide plate (12). A handle (38) is fixedly connected to the bottom surface of the rotating rod (36). The rotating rod (36) is connected through the fixed box (11). Sliding grooves (39) are symmetrically provided on both sides of the rotating rod (36) close to the fixed box (11). A second telescopic rod (40) is fixedly installed inside the sliding groove (39). A fifth spring (41) is sleeved on the surface of the second telescopic rod (40). A limiting rod (42) is fixedly connected to the bottom surface of the fifth spring (41). The top surface of the fifth spring (41) is fixedly connected to the sliding groove (39), and the bottom surface of the second telescopic rod (40) is fixedly connected to the limiting rod (42).

6. A dustproof pulley according to claim 1, characterized in that: A plurality of second limiting grooves (43) are provided on the bottom surface of the fixed box (11), and the second limiting grooves (43) are snap-fitted and connected to the limiting rods (42).

7. The dustproof pulley according to claim 1, characterized in that: The bottom surface of the bearing (2) is provided with a plurality of placement grooves (44), a third telescopic rod (45) is fixedly installed inside the placement groove (44), a sixth spring (46) is sleeved on the surface of the third telescopic rod (45), a rubber pad (47) is fixedly connected to the bottom surface of the sixth spring (46), the top surface of the sixth spring (46) is fixedly connected to the placement groove (44), the bottom surface of the third telescopic rod (45) is fixedly connected to the rubber pad (47), and the bottom surface of the rubber pad (47) is fitted and connected to the body (1).

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